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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>select下拉表单元素</title>
</head>
<body>
    籍贯：
    <select>
        <option>山东</option>
        <option>北京</option>
        <option>长沙</option>
        <option selected=“selected”>重庆</option>
        <option>浙江</option>
    </select>
    <!-- 
        1.<select> 中至少包含一对 <option> 
        2.在 <option> 中定义 selected=“selected” 时，当前项即为默认选中项
     -->
</body>
</html>